There are opposing factors that influence population growth rates. Pronatalist pressures increase desire to have children while birth reduction pressures in developed countries, like higher education and women's freedom, result in fewer children. Most countries experience a demographic transition as development improves living conditions and death rates fall faster than birth rates. Some experts believe this transition will lead world population to stabilize in the 21st century, while others warn many poor countries may be trapped in high population growth due to resource shortages preventing development. Ensuring social justice, women's empowerment, child survival and access to family planning are key to successfully slowing growth rates.